SB2026070293 - Improper locking in Linux kernel bluetooth
Published: July 2, 2026
Security Bulletin ID
SB2026070293
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper locking (CVE-ID: CVE-2026-53358)
CWE-ID: CWE-667 - Improper Locking
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper locking in l2cap_sock_cleanup_listen() when cleaning up listening L2CAP channels. A local user can trigger a race condition to cause a denial of service.
The issue involves incorrect lock ordering between conn->lock, chan->lock, and sk_lock during Bluetooth L2CAP channel cleanup.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/3634cbdc2eb414b69ffa752ddbe5e0458518e321
- https://git.kernel.org/stable/c/50dfec218808b148ab4247b1858031b7a32015c5
- https://git.kernel.org/stable/c/7555fd885a0603f50e49a655850a1f2bd8a25398
- https://git.kernel.org/stable/c/859d3ace791ed878ae9ba5522c7844d960da8f88
- https://git.kernel.org/stable/c/89dec92041717b027216e110599e4f6d6c921b79
- https://git.kernel.org/stable/c/8c8e620467a7b51562dbcefbd1f09f288d7d710d
- https://git.kernel.org/stable/c/deb8493a8fa599f6c95e2465b12bfdfb7f94a1d9
- https://git.kernel.org/stable/c/e1c100e2d61bd8c718b7d91fe3e050780a9bf72d